The framework calls this member function to implement a message box for the global function AfxMessageBox.
virtual int DoMessageBox(
   LPCTSTR lpszPrompt,
   UINT nType,
   UINT nIDPrompt 
);
Parameters
lpszPrompt
Address of text in the message box.nType
The message box style.nIDPrompt
An index to a Help context string.
Return Value
Returns the same values as AfxMessageBox.
Remarks
Do not call this member function to open a message box; use AfxMessageBox instead.
Override this member function to customize your application-wide processing of AfxMessageBox calls.
Requirements
Header: afxwin.h